EP3450060B1 - Lamination molding apparatus and method for manufacturing lamination molded product - Google Patents

Lamination molding apparatus and method for manufacturing lamination molded product Download PDF

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Publication number
EP3450060B1
EP3450060B1 EP18190783.3A EP18190783A EP3450060B1 EP 3450060 B1 EP3450060 B1 EP 3450060B1 EP 18190783 A EP18190783 A EP 18190783A EP 3450060 B1 EP3450060 B1 EP 3450060B1
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EP
European Patent Office
Prior art keywords
temperature
molding apparatus
layer
solidified layer
lamination molding
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP18190783.3A
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German (de)
English (en)
French (fr)
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EP3450060A1 (en
Inventor
Ichiro Araie
Kazufumi Nambu
Atsushi Hirota
Hiroshi Amioka
Shuji Okazaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sodick Co Ltd
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Sodick Co Ltd
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Publication date
Priority claimed from JP2017165090A external-priority patent/JP6295001B1/ja
Priority claimed from JP2018033842A external-priority patent/JP6560775B1/ja
Priority claimed from JP2018104432A external-priority patent/JP6556296B1/ja
Application filed by Sodick Co Ltd filed Critical Sodick Co Ltd
Publication of EP3450060A1 publication Critical patent/EP3450060A1/en
Application granted granted Critical
Publication of EP3450060B1 publication Critical patent/EP3450060B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/10—Formation of a green body
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/10—Processes of additive manufacturing
    • B29C64/141—Processes of additive manufacturing using only solid materials
    • B29C64/153—Processes of additive manufacturing using only solid materials using layers of powder being selectively joined, e.g. by selective laser sintering or melting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B22F3/1003—Use of special medium during sintering, e.g. sintering aid
    • B22F3/1007—Atmosphere
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K15/00—Electron-beam welding or cutting
    • B23K15/0046—Welding
    • B23K15/0086—Welding welding for purposes other than joining, e.g. built-up welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
    • B29C64/295—Heating elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y10/00—Processes of additive manufacturing
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    • B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
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    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
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    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
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    • B33Y70/00—Materials specially adapted for additive manufacturing
    • B33Y70/10—Composites of different types of material, e.g. mixtures of ceramics and polymers or mixtures of metals and biomaterials
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/06—Surface hardening
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    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/20—Direct sintering or melting
    • B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/30—Process control
    • B22F10/36—Process control of energy beam parameters
    • B22F10/362—Process control of energy beam parameters for preheating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
    • B22F12/10—Auxiliary heating means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
    • B22F12/20—Cooling means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
    • B22F12/22—Driving means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
    • B22F12/40—Radiation means
    • B22F12/41—Radiation means characterised by the type, e.g. laser or electron beam
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
    • B22F12/60—Planarisation devices; Compression devices
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B22F3/24—After-treatment of workpieces or articles
    • B22F2003/247—Removing material: carving, cleaning, grinding, hobbing, honing, lapping, polishing, milling, shaving, skiving, turning the surface
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    • B22F3/24—After-treatment of workpieces or articles
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
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    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0838—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using laser
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C35/0866—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using particle radiation
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    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/001—Austenite
    • C—CHEMISTRY; METALLURGY
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    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite
    • C—CHEMISTRY; METALLURGY
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    • C21D2221/00—Treating localised areas of an article
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • the present invention relates to a lamination molding apparatus and to a method for manufacturing lamination molded product.
  • SLS Selective Laser Sintering
  • SLM Selective Laser Melting
  • EBS Electron Beam Sintering
  • EBM Electron Beam Melting
  • LOM Laminated Object Manufacturing
  • a material layer made of a metal material is formed, and then a predetermined portion of the material layer is irradiated with a beam such as laser beam or electron beam to sinter or melt the material layer at the irradiated position.
  • a beam such as laser beam or electron beam to sinter or melt the material layer at the irradiated position.
  • These processes are repeated to laminate a plurality of sintered layers or melted layers, thereby forming a desired three-dimensional molded product.
  • the first material layer can be formed on a molding plate placed in a chamber.
  • solidify solidify
  • solidified layer solidified layer
  • the solidified layer In lamination molding of metal, the solidified layer has a very high temperature immediately after being solidified. The temperature of the solidified layer drops sharply due to heat radiation to other solidified layer already formed, to the molding plate, and to the atmosphere. During such temperature drop, the volume of the solidified layer shrinks since the thermal expansion coefficient of metal is normally positive. However, since the solidified layer is adhered to the adjacent solidified layer or the molding plate, the amount of such shrinkage is restricted, and thus a tensile stress remains in the solidified layer.
  • the metal material is a martensitic material such as carbon steel, martensitic stainless steel
  • the solidified layer immediately after formation is in an austenite phase, and at least a part of the austenite phase is transformed into a martensite phase by cooling within predetermined temperature conditions. Since martensitic transformation involves volumetric expansion, a compressive stress is generated.
  • the martensitic transformation can be intentionally made to take place with the solidified layer, thereby reducing the tensile stress of metal by shrinkage with the compressive stress by the martensitic transformation. Accordingly, the residual stress of the molded product can be controlled.
  • a lamination molding apparatus comprising: a material layer former to form a material layer in a molding region, the material layer being formed for each of a plurality of divisional layers which are a desired three-dimensional molded product divided by a predetermined height; a first emitter configured to form a solidified layer by irradiating a predetermined irradiation region of the material layer in the predetermined divisional layer with a first beam to sinter or melt the material layer; and a thermal adjuster configured to adjust a temperature of at least a portion of the solidified layer to a predetermined first temperature and then to a predetermined second temperature; characterised in that when the first temperature is referred to as T1, the second temperature is referred to as T2, a martensite start temperature of the solidified layer is referred to as Ms, and a martensite finish temperature of the solidified layer is referred to as Mf, following formulas of (1) to (3) are all satisfied.
  • a method for manufacturing a lamination molded product comprising the steps of: a material layer forming step to form a material layer in a molding region, the material layer being formed for each of a plurality of divisional layers which are a desired three-dimensional molded product divided by a predetermined height; a solidifying step to form a solidified layer by irradiating a predetermined irradiation region in the material layer of the divisional layer with a first beam and sintering or melting the predetermined irradiation region; an initial thermal adjustment step to adjust the temperature of at least a portion of the solidified layer to a predetermined first temperature; and a next thermal adjustment step to adjust the temperature of the at least a portion of the solidified layer having the first temperature to a predetermined second temperature; characterised in that when the first temperature is referred to as T1, the second temperature is referred to as T2, a martensite start temperature of the solidified layer is referred to as Ms, and a marten
  • the lamination molding apparatus intentionally allows martensitic transformation to occur while performing lamination molding. Accordingly, tensile stress generated with the molded product is suppressed, thereby decreasing the deformation of the molded product.
  • the lamination molding apparatus comprises a chamber 1, a material layer former 2, an irradiation unit 3A, and a cutting device 4.
  • a clean inert gas is supplied into the chamber 1 covering the predetermined molding region RM, and an inert gas containing fume generated during sintering or melting the material layer 63 is discharged from the chamber 1. Accordingly, the chamber 1 is filled with an inert gas having a predetermined concentration.
  • Inert gas refers to a gas which substantially does not react with the material used, and is nitrogen or argon for example.
  • the material layer former 2 to form a material layer 63 in the molding region RM is provided in the chamber 1.
  • the material layer 63 is formed for each of a plurality of divisional layers of a desired three-dimensional molded product divided by a predetermined height.
  • the material layer former 2 comprises a base 21 including the molding region RM, and a recoater head 23 arranged on the base 21, the recoater head 23 reciprocating in a horizontal direction which is shown by arrow B. Blades are provided on both sides of the recoater head 23, respectively.
  • the recoater head 23 reciprocates while discharging the material powder contained in the recoater head 23 from a bottom surface of the recoater head 23.
  • the blades planarize the discharged material powder to form the material layer 63.
  • a molding table 25 which moves vertically, namely moves in a direction shown by arrow U, by the molding table driving mechanism 27 is provided.
  • the molding plate 61 is usually arranged on the molding table 25, and the first layer of the material layer 63a is formed on the molding plate 61.
  • a powder retaining wall 29 is provided around the molding table 25, in a powder retaining space which is surrounded by the powder retaining wall 29 and the molding table 25, unsolidified material powder is retained.
  • the molding region RM is a region capable of forming the lamination molded product, and the material layer 63 is formed in the molding region RM.
  • an irradiation region RI is a region in the molding region RM in which a solidified layer 65 is formed, and roughly matches with a region surrounded by the contour shape of the desired three-dimensional molded product.
  • the irradiation unit 3A is provided above the chamber 1.
  • the irradiation unit 3A according to the first embodiment comprises a first emitter 31 to form the solidified layer by irradiating a predetermined irradiation region RI of the material layer 63 with the first beam L1 and sintering or melting the predetermined irradiation region RI, and a scanner 34 to scan the first beam L1.
  • the first emitter 31 comprises a first light source 311, a first collimator 313, and a first focus controller 315.
  • the first light source 311 emits the first beam L1.
  • the first beam L1 is a laser beam which can sinter or melt the material layer 63, and is a CO 2 laser, fiber laser, or a YAG laser, for example.
  • the first collimator 313 converts the first beam L1 emitted from the first light source 311 into a parallel light.
  • the first focus controller 315 focuses the first beam L1 emitted from the first light source 311 and adjusts the diameter of the first beam L1 to a desired spot diameter.
  • the scanner 34 is a two-axis galvanometer scanner for example.
  • the galvanometer scanner is provided with a pair of galvanometer mirrors 34x and 34y, and two actuators to rotate the galvanometer mirrors 34x and 34y, respectively.
  • the two-axis galvanometer scanner 34 performs two-dimensional scanning by controlling the first beam L1 emitted from the first light source 311.
  • a control device (not shown) supplies control signals to the two actuators to control rotation angles around two axes of the galvanometer mirrors 34x and 34y. Accordingly, the first beam L1 can be emitted to a desired position by altering the control signals being input to the two actuators.
  • the first beam L1 which passed through the galvanometer mirrors 34x and 34y further passes through a protection window 11 provided at the upper portion of the chamber 1. Accordingly, the material layer 63 formed in the molding region RM is irradiated with the first beam L1.
  • a contamination prevention device 13 is provided so as to cover the protection window 11.
  • the contamination prevention device 13 is structured so as to fill the supplied inert gas under the protection window 11, and to discharge the inert gas towards below. Accordingly, fume is removed from the pathway of the first beam L1, and the protection window 11 is prevented from being contaminated by the fume.
  • the cutting device 4 has a machining head 41 provided with a spindle head 43.
  • the spindle head 43 can be rotated with a cutting tool such as an end mill attached to the spindle head 43.
  • the machining head 41 moves the spindle head 43 to a desired position within the chamber 1 by a machining head driving mechanism (not shown).
  • Such cutting device 4 can perform cutting to the surface or unnecessary portions of the solidified layer 65.
  • the lamination molding apparatus comprises a thermal adjuster which adjusts the temperature of at least a portion of the solidified layer to at least one of a predetermined first temperature T1 and a predetermined second temperature T2.
  • a thermal adjuster which adjusts the temperature of at least a portion of the solidified layer to at least one of a predetermined first temperature T1 and a predetermined second temperature T2.
  • the solidified layer subjected to thermal adjustment that is, the solidified layer in which the thermal adjustment performed in the order of the first temperature T1 and the second temperature T2 has never been completed is referred to as an upper surface layer.
  • the thermal adjustment is not limited to an active temperature operation performed by the thermal adjuster.
  • the surrounding temperature can be an appropriate temperature as the first temperature T1 or the second temperature T2. In such case, the thermal adjuster can adjust the temperature only to either one of the first temperature T1 or the second temperature T2.
  • the thermal adjuster according to the first embodiment adjusts the temperature of at least a portion of the upper surface layer in the order of the first temperature T1 and the second temperature T2.
  • the thermal adjuster according to the first embodiment adjusts the temperature of at least a portion of the upper surface layer in the order of the first temperature T1, the second temperature T2, and the first temperature T1.
  • the first temperature T1, the second temperature T2, the martensite start temperature Ms of the solidified layer 65, and the martensite finish temperature Mf of the solidified layer 65 the following formulas of (1) to (3) are all satisfied.
  • the upper surface layer before being subjected to the thermal adjustment is in a condition containing the austenite phase. At least a portion of the austenite phase is transformed into the martensite phase by the thermal adjustment.
  • the thermal adjuster need only be structured so as to be capable of carrying out the thermal adjustment of the temperature of the upper surface layer to at least one of the first temperature T1 and the second temperature T2.
  • the thermal adjuster comprises at least one of a heater to adjust the temperature of the upper surface layer to the first temperature T1 and a cooler to cool the temperature of the upper surface layer to the second temperature T2.
  • the thermal adjuster comprises both of the heater and the cooler.
  • a first thermal adjuster 51 and a second thermal adjuster 52 are shown.
  • the first thermal adjuster 51 comprises a heater 51a and a cooler 51b arranged inside the molding table 52.
  • the heater 51a is, for example, an electric heater or a pipeline in which a heating medium flows.
  • the cooler 51b is, for example, a pipeline in which a heating medium flows.
  • As the heating medium various fluids such as water, oil, liquid nitrogen can be used.
  • the molding table 25 comprises a top plate 25a and three supporting plates 25b, 25c, and 25d. Between the top plate 25a and the supporting plate 25b, the heater 51a is provided. Between the supporting plate 25c and the supporting plate 25d, the cooler 51b is provided.
  • the temperature of the molding table 25 can be controlled to a desired temperature including the first temperature T1 and the second temperature T2 by the heater 51a and the cooler 51b.
  • a constant temperature section of which temperature is maintained constant can be provided between the first thermal adjuster 51 and the molding table driving mechanism 27.
  • the temperature of the upper surface layer can be adjusted to the desired temperature by the molding plate 61 which is in contact with the top plate 51c of the molding table 25 having a temperature controlled at the desired temperature, and by the solidified layer 65 positioned lower than the upper surface layer.
  • the material layer 63 is preheated to a predetermined temperature before sintering or melting, and the first thermal adjuster 51 can serve also as the preheating device of the material layer 63.
  • the first temperature T1 is appropriate as the preheating temperature
  • the temperature of the material layer 63 is preheated to the first temperature T1 by the first thermal adjuster 51.
  • the second thermal adjuster 52 shown in Fig. 4 comprises a heater 52a to adjust the temperature of the upper surface layer from its upper side to the first temperature T1, and a cooler 52b to adjust the temperature of the upper surface layer from its upper side to the second temperature T2.
  • the heater 52a is, for example, a heating light source such as a halogen lamp.
  • the cooler 52b is, for example, an air blower which blows a cooled gas such as the same kind of the inert gas filling the chamber 1 onto the upper surface layer, or a cooling structure which allows a cooled plate cooled by a Peltier element and the like to come in contact with the upper surface layer.
  • the temperature of the upper surface layer can be directly adjusted, and thus thermal adjustment of the upper surface layer can be performed swiftly even after a plurality of solidified layers 65 are formed.
  • the thermal adjuster need only be structured so as to be capable of carrying out the thermal adjustment of the temperature of the upper surface layer to at least one of the first temperature T1 and the second temperature T2, and can adopt various configurations.
  • the thermal adjuster one of or both of the first thermal adjuster 51 and the second thermal adjuster 52 can be provided.
  • the thermal adjuster can have any combination of the heater 51a and the cooler 51b of the first thermal adjuster 51, and the heater 52a and the cooler 52b of the second thermal adjuster 52.
  • the thermal adjuster can have other configuration.
  • the lamination molding apparatus can have a temperature sensor 55 to measure the temperature of the upper surface layer, and the thermal adjuster can be feedback-controlled in accordance with a temperature measured by the temperature sensor 55.
  • temperature of the upper surface layer can be controlled with higher accuracy.
  • One or a plurality of temperature sensors 55 can be provided.
  • the temperature sensor 55 is, for example, an infrared temperature sensor.
  • a step to form the material layer 63 in the molding region RM, the material layer 63 being formed for the plurality of divisional layers which are the desired three-dimensional molded product divided by a predetermined height is referred to as a material layer forming step.
  • a step to form the solidified layer 65 by irradiating the predetermined irradiation region RI of the material layer 63 with the first beam L1 and sintering or melting the predetermined irradiation region RI is referred to as a solidifying step.
  • a step to adjust the temperature of at least a portion of the upper surface layer to the predetermined first temperature T1 is referred to as an initial thermal adjustment step.
  • a step to adjust the temperature of the at least a portion of the upper surface layer at the first temperature T1 to the predetermined second temperature T2 is referred to as a next thermal adjustment step.
  • the thermal adjustment performed in the initial thermal adjustment step and the next thermal adjustment step are not limited to an active temperature operation performed by the thermal adjuster.
  • a step to preheat the material layer 63 before being irradiated with the first beam L1 is referred to as a preheating step.
  • the temperature to which the material layer 63 is to be preheated is appropriately selected depending on the material.
  • the preheating temperature can be the first temperature T1.
  • the time required to raise the temperature to the first temperature T1 in the initial thermal adjustment step can be shortened.
  • the first material layer forming step is carried out.
  • the molding plate 61 is placed on the molding table 25, and the height of the molding table 25 is adjusted to an appropriate position.
  • the recoater head 23 filled with the material powder is moved in the direction shown by arrow B, thereby forming the first layer of the material layer 63a on the molding plate 61.
  • the first preheating step is carried out after or simultaneously with the first material layer forming step.
  • the temperature of the molding table 25 is adjusted to the predetermined preheating temperature, the first temperature T1 in this case, by the first thermal adjuster 51. Accordingly, preheating of the first layer of the material layer 63a is carried out.
  • the first solidifying step is carried out.
  • a predetermined portion in the first layer of the material layer 63a is irradiated with the first beam L1 to sinter or melt the portion irradiated with the first beam L1, to obtain the first layer of the solidified layer 65a as shown in Fig. 6 .
  • the second material layer forming step is carried out.
  • the height of the molding table 25 is descended by a predetermined thickness of the material layer 63, and then the recoater head 23 is moved in the direction shown by arrow B, to form a second layer of the material layer 63b on the first layer of the solidified layer 65a.
  • the preheating step is carried out to preheat the second layer of the material layer 63b.
  • the second solidifying step is carried out.
  • a predetermined portion in the second layer of the material layer 63b is irradiated with the first beam L1 to sinter or melt the portion irradiated with the first beam L1, to obtain the second layer of the solidified layer 65b as shown in Fig. 7 .
  • the initial thermal adjustment step is preferably carried out simultaneously with the afore-mentioned steps.
  • the preheating temperature is the first temperature T1
  • the solidified layer 65 formed by the solidifying step that is the upper surface layer
  • the thermal adjuster is kept at the first temperature T1.
  • the preheating step to the material layer 63 serves also as the initial thermal adjustment step to the upper surface layer.
  • the next thermal adjustment step is carried out.
  • the thermal adjuster adjusts the temperature of the upper surface layer retained at the first temperature T1 to the second temperature T2.
  • the thermal adjuster adjusts the temperature of the upper surface layer to a preheating temperature, in this case, to the first temperature T1 in preparation for the next preheating step.
  • a cutting step can be carried out to perform cutting to the end face of the solidified layers 65 by a cutting tool mounted to the spindle head 43.
  • the cutting is performed to the upper surface layer after being subjected to the next thermal adjustment step. Accordingly, since the cutting is performed to the upper surface layer which went through the martensitic transformation and has a stable dimension, cutting can be performed with higher accuracy. More preferably, cutting is performed to the upper surface layer after being subjected to the next thermal adjustment step and thermal adjustment to normal temperature. By such, cutting can be performed to the upper surface layer while suppressing the effect of the expansion or shrinkage caused by temperature.
  • the normal temperature is defined as a temperature from about 5°C to about 35°C.
  • a sputter generated during sintering or melting adheres onto the surface of the solidified layer 65 to form a protrusion.
  • the recoater head 23 collides with the protrusion during the material layer forming step, the upper face of the uppermost solidified layer 65 can be subjected to cutting.
  • the material layer forming step, the preheating step, the solidifying step, the initial thermal adjustment step, the next thermal adjustment step, and the cutting step as such are repeated as necessary, thereby forming the desired three-dimensional molded product.
  • the initial thermal adjustment step and the next thermal adjustment step can be carried out each time when one layer of the solidified layer 65 is formed, each time after a plurality of the solidified layers 65 are formed, or can be carried out immediately before the cutting step is carried out.
  • the initial thermal adjustment step can be carried out simultaneously with other steps.
  • the cycle for carrying out the initial thermal adjustment step and the next thermal adjustment step can be set variably depending on the shape of the molded product for example.
  • the second embodiment according to the present invention will be described with reference to the drawings.
  • the characteristic matters shown in the embodiments can be combined with each other.
  • the constituent elements that are substantially the same as the constituent elements of the first embodiment are provided with the same reference numbers, and detailed explanations of the constituent elements are omitted.
  • the chamber 1, the material layer former 2, and the cutting device 4 are substantially the same as the constituent elements of the first embodiment.
  • the irradiation unit 3B comprises a first emitter 31 to form the solidified layer 65 by irradiating the predetermined irradiation region RI of the material layer 63 with the first beam L1 and sintering or melting the predetermined irradiation region RI, a second emitter 32 to adjust the temperature of the solidified layer 65 to the predetermined first temperature T1 by irradiating the solidified layer 65 formed by the first beam L1 with a second beam L2,a polarizer 33, and a scanner 34 to scan the first beam L1 and the second beam L2.
  • the first emitter 31 comprises a first light source 311, a first collimator 313, and a first focus controller 315.
  • the second emitter 32 comprises a second light source 321, and a second collimator 323.
  • the second emitter 32 can further comprise a second focus controller to adjust the diameter of the second beam L2 emitted from the second light source 321 to a desired spot diameter.
  • the first light source 311 emits the first beam L1.
  • the first beam L1 is a laser beam which can sinter or melt the material layer 63, and is a CO 2 laser, a fiber laser, or a YAG laser, for example.
  • the first collimator 313 converts the first beam L1 emitted from the first light source 311 into a parallel light.
  • the first focus controller 315 focuses the first beam L1 emitted from the first light source 311 and adjusts the diameter of the first beam L1 to a desired spot diameter. Then, the first beam L1 reaches the polarizer 33, and the polarized first beam L1 progresses to the galvanometer mirrors 34x and 34y of the scanner 34. In this case, the polarized first beam L1 is a reflected light.
  • the second light source 321 emits the second beam L2.
  • the second beam L2 is a laser beam which can adjust the temperature of the solidified layer 65, especially the temperature of the upper surface layer to the first temperature T1, and is a CO 2 laser, a fiber laser, or a YAG laser, for example.
  • the second collimator 323 converts the second beam L2 emitted from the second light source 321 into a parallel light.
  • the second beam L2 reaches to transmit through the polarizer 33, and the transmitted beam of the second beam L2 progress to the galvanometer mirrors 34x and 34y of the scanner 34.
  • the second beam L2 adjusts the temperature of the upper surface layer to the first temperature T1.
  • the third thermal adjuster according to the second embodiment comprises the second emitter 32 which adjusts the temperature of the upper surface layer to the first temperature T1 by irradiating with the second beam L2, the upper surface layer formed by the first beam L1.
  • a fourth thermal adjuster to adjust the temperature of the upper surface layer to the second temperature T2 is provided.
  • the fourth thermal adjuster comprises, for example, a cooler which is provided in the molding table 25 and adjusts the temperature of the upper surface layer to the second temperature T2.
  • the cooler is, for example, a pipeline in which a heating medium flows.
  • the second beam L2 is used also to preheat the material layer 63 before being irradiated with the first beam L1.
  • the second beam L2 is used for preheating, other measure to preheat the material layer 63 is not always necessary.
  • the heater for preheating in the molding table 25 need not be provided.
  • the irradiation spot of the second beam L2 is larger than the irradiation spot of the first beam L1, and the irradiation spot of the second beam L2 encloses the irradiation spot of the first beam L1.
  • the irradiation spot means a shape of the irradiation position of the first beam L1 and the second beam L2, that is, a shape of the first beam L1 and the second beam L2 at the material layer 63 or the solidified layer 65.
  • d2/d1 satisfies, for example, 10 ⁇ d2/d1 ⁇ 1000.
  • the polarizer 33 allows either one of the first beam L1 or the second beam L2 to transmit through, and polarizes the other to the same optical path as the one which transmitted.
  • the polarizer 33 is, for example, a filter such as a beam splitter.
  • the first beam L1 polarized by the polarizer 33 and the second beam L2 which transmitted through the polarizer 33 have the same optical axis and progress to the galvanometer mirrors 34x and 34y. With such constitution, one scanner 34 can allow scanning of the first beam L1 and the second beam L2 with their central position being roughly matched.
  • the first emitter 31 and the second emitter 32 were arranged so that the first beam L1 polarized by the polarizer 33 and the second beam L2 which transmitted through the polarizer 33 have the same optical axis and progress to the galvanometer mirrors 34x and 34y.
  • the first emitter 31 and the second emitter 32 can be replaced with each other so that the first beam L1 which transmitted through the polarizer 33 and the second beam L2 polarized by the polarizer 33 have the same optical axis and progress to the galvanometer mirrors 34x and 34y.
  • the scanner 34 is a two-axis galvanometer scanner for example.
  • the galvanometer scanner is provided with a pair of galvanometer mirrors 34x and 34y, and actuators to rotate the galvanometer mirrors 34x and 34y, respectively.
  • the two-axis galvanometer scanner 34 performs two-dimensional scanning by controlling the first beam L1 and the second beam L2 emitted from the first light source 311 and the second light source 321, respectively.
  • a control device (not shown) supplies control signals to the two actuators to control rotation angles around two axes of the galvanometer mirrors 34x and 34y. Accordingly, the first beam L1 and the second beam L2 having the same optical axis can be emitted to a desired position by altering the control signals being input to the two actuators.
  • the first beam L1 and the second beam L2 which passed through the galvanometer mirrors 34x and 34y further pass through the protection window 11 provided at the upper portion of the chamber 1. Accordingly, the material layer 63 formed in the molding region RM is irradiated with the first beam L1 and the second beam L2.
  • the method for scanning the first beam L1 and the second beam L2 according to the second embodiment will be described.
  • the irradiation region RI of each of the divisional layer is divided to one or more divisional regions by a predetermined width w.
  • Scanning of the first beam L1 and the second beam L2 are carried out for each of the divisional region. Specifically, as shown by the arrow in Fig. 11 , in the divisional region, scanning of the first beam L1 and the second beam L2 in a predetermined width w is performed in order along a scanning direction s which crosses orthogonally with the predetermined width w.
  • the irradiation spot of the second beam L2 is larger than the irradiation spot of the first beam L1, and the center of each of the irradiation spots are approximately the same. Accordingly, each of the positions in the irradiation region RI is irradiated longer by the second beam L2 than the first beam L1.
  • the afore-mentioned method to scan the first beam L1 and the second beam L2 are merely an example, and various scanning method can be adopted. Specifically, an example of a so-called raster scanning was shown above, however, it can be a vector scanning, or a combination of the raster scanning and the vector scanning.
  • the divisional region can also be set by any other method.
  • the temperature of the upper surface layer is adjusted to the first temperature T1 by using at least the second emitter 32, and then the temperature of the upper surface layer is adjusted to the second temperature T2.
  • the following formulas of (1) to (3) are also all satisfied. T 1 ⁇ Mf T 1 > T 2 T 2 ⁇ Ms
  • the upper surface layer after sintering or melting and before thermal adjustment to the second temperature T2 is in a condition containing the austenite phase, and at least a portion of the austenite phase is transformed into the martensite phase by the thermal adjustment to the second temperature T2.
  • the upper surface layer is the uppermost solidified layer 65 at the point where the initial thermal adjustment step is carried out.
  • the temperature of the upper surface layer can be adjusted to the first temperature T1.
  • the temperature of the upper surface layer in which the temperature adjusted to the first temperature T1 is adjusted to the second temperature T2 by heat radiation to below layers of the solidified layer 65 and the molding plate 61, and to the inert gas atmosphere.
  • the fourth thermal adjuster when the fourth thermal adjuster is provided, for example, when the temperature of the molding table 25 is adjusted to a temperature approximately the same as the second temperature T2, thermal adjustment of the temperature of the upper surface layer to the second temperature T2 can be performed more efficiently.
  • the lamination molding apparatus can have a temperature sensor 55 to measure the temperature of the uppermost material layer 63 or the upper surface layer, and the thermal adjuster can be feedback-controlled in accordance with a temperature measured by the temperature sensor 55.
  • a temperature measured by the temperature sensor 55 For example, the scanning speed, laser strength, and the size of the diameter of the irradiation spot of the second beam L2, can be feedback-controlled. With such configuration, temperature of the uppermost material layer 63 or the upper surface layer can be controlled with higher accuracy.
  • One or a plurality of temperature sensors 55 can be provided.
  • the temperature sensor 55 is, for example, an infrared temperature sensor.
  • the preheating step and the initial thermal adjustment step are performed by the second beam L2.
  • the material layer forming step is carried out.
  • a material layer 63 is formed on the molding plate 61 placed on an appropriate position of the molding table 25, or on the solidified layer 65, using the recoater head 23.
  • the preheating step, the solidifying step, the initial thermal adjustment step, and the next thermal adjustment step are carried out.
  • the preheating step, the solidifying step, the initial thermal adjustment step, and the next thermal adjustment step are carried out in parallel, however, when focused on a particular position, the processes are carried out in the order of the preheating step, the solidifying step, the initial thermal adjustment step, and the next thermal adjustment step.
  • a particular position P in Figs. 12A through Figs. 12E is focused.
  • scanning of the first beam L1 and the second beam L2 in the direction of the predetermined width w are roughly shown, where the scanning passage includes the predetermined position P.
  • the predetermined position P is not irradiated with the first beam L1 and the second beam L2.
  • the first preheating is carried out at the predetermined position P.
  • the first beam L1 and the second beam L2 are scanned, and thus the predetermined position P is irradiated with the second beam L2. Accordingly, the predetermined position P is preheated to a temperature suitable for being solidified.
  • the material layer 63 at the vicinity of the starting point of the scanning in each of the divisional region is irradiated with the second beam L2 for a predetermined time before the first beam L1 and the second beam L2 are scanned in the divisional region, until the vicinity of the starting point is heated to the temperature suitable for being solidified.
  • the solidifying step is carried out at the predetermined position P. That is, as shown in Fig. 12C , the predetermined position P in the material layer 63 is irradiated with the first beam L1 and the material layer 63 at the position of laser irradiation is sintered or melted. That is, the predetermined position P becomes a part of the solidified layer 65.
  • the initial thermal adjustment step is carried out at the predetermined position P.
  • the predetermined position P which became a part of the solidified layer 65 is irradiated with the second beam L2.
  • the temperature of the predetermined position P reaches at least the first temperature T1 by irradiation with the second beam L2.
  • the solidified layer 65 at the vicinity of the end point of the scanning in each of the divisional region is adjusted to the second temperature T2
  • the solidified layer 65 at the vicinity of the end point of the scanning is irradiated with the second beam L2 for a predetermined time after the scanning with the first beam L1 and the second beam L2 are completed and until sufficient irradiation with the second beam L2 is performed.
  • the time during which the temperature is maintained at the first temperature T1 in the initial thermal adjustment step and a value of the first temperature T1 is set to a suitable value depending on the metal material being used or the metal material expected to be used.
  • the time and the value of the first temperature T1 in the initial thermal adjustment step can be adjusted by the scanning speed, laser strength, and the diameter of the irradiation spot of the second beam L2.
  • the next thermal adjustment step is carried out at the predetermined position P.
  • the temperature of the predetermined position P reaches the second temperature T2 by heat radiation to below layers of the solidified layer 65 and the molding plate 61, and to the inert gas atmosphere.
  • the material layer forming step, the preheating step, the solidifying step, the initial thermal adjustment step, and the next thermal adjustment step, and preferably the cutting step suitably inserted are repeated to form the desired three-dimensional molded product.
  • the material layer forming step, the preheating step, the solidifying step, the initial thermal adjustment step, and the next thermal adjustment step were carried out in parallel, however, the material layer forming step, the preheating step, the solidifying step, the initial thermal adjustment step, and the next thermal adjustment step need not be carried out in parallel so long as the material layer forming step, the preheating step, the solidifying step, the initial thermal adjustment step, and the next thermal adjustment step are carried out in this order at each position.
  • the initial thermal adjustment step and the next thermal adjustment step can be carried out.
  • the upper surface layer is the one or a plurality of layers of the solidified layer 65 including at least the uppermost solidified layer at the point of the initial thermal adjustment step.
  • the initial thermal adjustment step and the next thermal adjustment step are performed for a plurality of times during molding to suppress tensile stress while performing lamination of the solidified layers 65.
  • the temperature in which the martensitic transformation occur is ranges from martensite finish temperature Mf to martensite start temperature Ms, inclusive. That is, the amount of expansion by the martensitic transformation, and eventually the residual stress of the molded product can be controlled by the relationship among the first temperature T1, the second temperature T2, the martensite start temperature Ms, and the martensite finish temperature Mf.
  • the thermal adjustment patterns as shown in Fig. 13 through Fig. 18 can be mentioned. In Fig. 13 through Fig. 18 , the temperature change in the first embodiment is shown.
  • the temperature change in the solidified layer 65 of the predetermined divisional layer, when the solidified layer 65 after solidification undergoes a thermal adjustment in the order of the first temperature T1, the second temperature T2, and the first temperature T1, is roughly shown.
  • Specific explanation of the temperature change at each point of time in the first embodiment is provided herein.
  • the material layer 63 is irradiated with the first beam L1, thereby forming the solidified layer 65.
  • the heat of the solidified layer 65 is radiated to the lower layer of the solidified layer 65, the molding plate 61 and the like, thereby maintaining the temperature of the solidified layer 65 at the first temperature T1 (t1).
  • the temperature of the solidified layer 65 is adjusted to the second temperature T2 (t3). After the thermal adjustment to the second temperature T2 is completed (t4), the temperature of the solidified layer 65 is raised again to the first temperature T1 (t5).
  • the present disclosure shall not be regarded as a limitation to the temperature change shown in Fig. 13 through Fig. 18.
  • Fig. 13 through Fig. 18 are merely a reference drawing to visually show the relation among each formula.
  • the same pattern can be applied for all of the solidified layers 65 of the divisional layers. However, a different pattern can be applied individually for the solidified layers 65 of each of the divisional layers.
  • the temperature control becomes easy since there is no restriction regarding the upper limit of the first temperature T1 and the lower limit of the second temperature T2 within the temperature range capable of performing thermal adjustment by the thermal adjuster.
  • the next thermal adjustment step is started when the temperature of the upper surface layer is greater than or equal to the martensite start temperature Ms and the next thermal adjustment step is performed until the temperature of the upper surface layer becomes equal to or less than martensite finish temperature Mf, that is, since martensitic transformation takes place in all of the temperature range capable of undergoing the martensitic transformation, reproducibility is high.
  • This controlling method is suitable for materials having an expansion amount due to the martensitic transformation which is equal to or smaller than the shrinkage amount generated during molding.
  • Pattern B only the second temperature T2 is included within the temperature range capable of undergoing the martensitic transformation. That is, the following formulas (1), (2), (3), (4), and (6) are all satisfied.
  • a schematic diagram of the temperature change of the predetermined solidified layer 65 with Pattern B is shown in Fig. 14 .
  • Pattern B there is no need to take into consideration the influence of the temperature increase of the solidified layer 65 due to irradiation with the first beam L1, and molding can be proceeded in a condition where the residual stress is suppressed.
  • the temperature is lowered after completion of molding, compressive stress can be generated.
  • This controlling method is suitable for materials having an expansion amount due to the martensitic transformation which is fairly larger than the shrinkage amount generated during molding.
  • both of the first temperature T1 and the second temperature T2 are included within the temperature range capable of undergoing the martensitic transformation. That is, the following formulas (1), (2), (3), (6), and (7) are all satisfied.
  • a schematic diagram of the temperature change of the predetermined solidified layer 65 with Pattern C is shown in Fig. 15 .
  • Pattern C when the temperature can be controlled accurately, the residual stress can be controlled during molding, and after finishing molding and cooling.
  • This controlling method is suitable for materials having an expansion amount due to the martensitic transformation which is fairly larger than the shrinkage amount generated during molding.
  • Pattern D only the first temperature T1 is included within the temperature range capable of undergoing the martensitic transformation. That is, the following formulas (1), (2), (3), (5), and (7) are all satisfied.
  • a schematic diagram of the temperature change of the predetermined solidified layer 65 with Pattern D is shown in Fig. 16 .
  • Pattern D although there is an influence of the temperature increase of the solidified layer 65 due to irradiation with the first beam L1, the residual stress during molding and the residual stress after completion of the molding are approximately the same, and thus control can be done easily. Especially, when the cutting step is performed with the solidified layer 65 having its temperature adjusted to the second temperature T2, the molded product can be finished with higher accuracy, which is preferable.
  • This controlling method is suitable for materials having an expansion amount due to the martensitic transformation which is fairly larger than the shrinkage amount generated during molding.
  • the first temperature T1 is required to have a higher temperature.
  • the second beam L2 is used to heat the upper surface layer, thereby allowing to realize high first temperature T1. Accordingly, the lamination molding apparatus according to the second embodiment is suitable to employ pattern A and pattern B.
  • Pattern B or pattern C when the second temperature T2 is not the same as the martensite finish temperature Mf, the martensitic transformation would further progress after the molding is completed and the temperature of the three-dimensional molded product becomes lower than the second temperature T2. This would result in the possibility of generation of undesired expansion. Accordingly, in Pattern B and Pattern C, it is preferable to set the second temperature T2 at or below the lowest temperature Tm at which the three-dimensional molded product would be subjected after being molded. That is, the following Pattern B2 and Pattern C2 are more preferable.
  • each of the temperature patterns as described above have limited application regarding the materials.
  • the temperature adjustment of the afore-mentioned Pattern A is carried out, at least the martensite start temperature Ms and the martensite finish temperature Mf need be included in the temperature range which can be controlled by the thermal adjuster, however, not all of the materials satisfy such conditions.
  • the martensite start temperature Ms and the martensite finish temperature Mf can vary depending on the carbon content of the material. Accordingly, by adjusting the carbon content of the material, the molding method according to the present invention utilizing the martensitic transformation can be applied to various materials.
  • a plurality of materials can be mixed. Specifically, to a first metal as the predetermined metal, at least one of a second metal as another metal having relatively high carbon content and carbon can be mixed. Accordingly, a material mixture having a desired martensite start temperature Ms or a martensite finish temperature Mf can be prepared.
  • the lamination molding apparatuses according to the first embodiment and the second embodiment of the present invention perform the lamination molding by SLS or SLM.
  • the lamination molding apparatus can perform the lamination molding by LOM.
  • the material layer former forms the material layer by using a metal sheet in the form of a plate, the metal sheet being used for each of the plurality of divisional layers of a desired three-dimensional molded product divided by a predetermined height. That is, instead of the material powder, a metal sheet in the form of a plate can be used to form the material layer, and the predetermined portion of the material layer can be irradiated with the first beam L1 to melt the metal sheet. These processes can be repeated.
  • a laser beam was used as the first beam L1, however, other constitution can be adopted so long as it can form the solidified layer 65.
  • the first beam L1 can be an electron beam.
  • a laser beam was used as the second beam L2, however, other constitution can be adopted so long as it can adjust the temperature of the solidified layer 65 to the first temperature T1.
  • the second beam L2 can be an electron beam.
  • the specific values of the first temperature T1 and the second temperature T2 can vary for each of the initial thermal adjustment step or the next thermal adjustment step.
  • a material powder made of SUS 420 J2 having an average particle diameter of 20 ⁇ m was used as the material, and lamination molding of a predetermined molded product was carried out on a molding plate 61 under various temperature conditions.
  • SUS 420 J2 is a martensitic stainless steel stipulated in the Japanese Industrial Standards, the carbon content before the molding being lower than 0.44 wt%, martensite start temperature Ms being approximately 100°C, and the martensite finish temperature Mf being approximately 0°C.
  • the size of the molding plate 61 was 125 x 125 x 15 mm (length x width x thickness).
  • the size of the molded product was 80 x 80 x 35 mm (length x width x thickness).
  • the temperature of the molding table 25 was adjusted to 70°C using the first thermal adjuster 51. Subsequently, the material layer forming step to spread the material powder uniformly on the molding table 25 by the recoater head 11 to form the material layer 63, and the solidifying step to sinter the material powder by irradiating a predetermined portion of the material layer 63 with a laser beam as the first beam L1 for 4 minutes were repeated, thereby forming an upper surface layer having a thickness of 5 mm formed by a plurality of solidified layers 65. Then, the temperature of the molding table 25 maintained at 70°C was lowered to 29°C. After the temperature of the upper layer was lowered to 29°C, the temperature of the molding table 25 was raised to 70°C.
  • the thermal adjustment step corresponding to the afore-mentioned Pattern D was carried out using the molding apparatus according to the first embodiment. Thereafter, similar processes were repeated 6 times to obtain a predetermined molded product. With the molded product thus obtained, the condition of the warp at the back face of the molding plate 61, that is, the face at the opposite side of the face onto which the molded product was formed, was measured to observe the condition of the residual stress. As a result, as shown in Fig. 19 and Fig. 20 , the residual stress was suppressed.
  • the temperature of the molding table 25 was maintained roughly constant at 24°C, and the material layer forming step and the solidifying step were repeated to obtain the predetermined molded product.

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JP2017165090A JP6295001B1 (ja) 2017-08-30 2017-08-30 積層造形装置および積層造形物の製造方法
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EP3450060A1 (en) 2019-03-06

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